diff --git a/scripts/change_url b/scripts/change_url
index 5fe0855..cd80a3b 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -27,10 +27,16 @@ app=$YNH_APP_INSTANCE_NAME
 ynh_script_progression --message="Loading installation settings..." --weight=1
 
 # Needed for helper "ynh_add_nginx_config"
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
+domain=$(ynh_app_setting_get --app=$app --key=domain)
 path_url=$(ynh_app_setting_get --app=$app --key=path)
+is_public=$(ynh_app_setting_get --app=$app --key=is_public)
+final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 port=$(ynh_app_setting_get --app=$app --key=port)
 
+db_name=$(ynh_app_setting_get --app=$app --key=db_name)
+db_user=$db_name
+db_pwd=$(ynh_app_setting_get --app=$app --key=db_pwd)
+
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
@@ -102,6 +108,22 @@ then
 	ynh_store_file_checksum --file="/etc/nginx/conf.d/$new_domain.d/$app.conf"
 fi
 
+#=================================================
+# MODIFY A CONFIG FILE
+#=================================================
+ynh_script_progression --message="Modifying a config file..."
+
+# Main config File
+ynh_replace_string --match_string="__PORT__"     --replace_string="$port"    --target_file="../conf/config.json.example"
+ynh_replace_string --match_string="__DOMAIN__"   --replace_string="$domain"  --target_file="../conf/config.json.example"
+ynh_replace_string --match_string="__PATH__"     --replace_string="${path_url:1}" --target_file="../conf/config.json.example"
+ynh_replace_string --match_string="__DB_USER__"  --replace_string="$db_user" --target_file="../conf/config.json.example"
+ynh_replace_string --match_string="__DB_NAME__"  --replace_string="$db_name" --target_file="../conf/config.json.example"
+ynh_replace_string --match_string="__DB_PASS__"  --replace_string="$db_pwd"  --target_file="../conf/config.json.example"
+ynh_replace_string --match_string="__APP__"      --replace_string="$app"     --target_file="../conf/config.json.example"
+
+cp ../conf/config.json.example "$final_path/config.json"
+
 #=================================================
 # GENERIC FINALISATION
 #=================================================